/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/sig.internal.h"
#include "libc/calls/struct/rlimit.h"
#include "libc/calls/syscall-nt.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/dce.h"
#include "libc/intrin/weaken.h"
#include "libc/nt/enum/fileinfobyhandleclass.h"
#include "libc/nt/errors.h"
#include "libc/nt/files.h"
#include "libc/nt/runtime.h"
#include "libc/sysv/consts/sicode.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/errfuns.h"
#include "libc/sysv/pib.h"
#if SupportsWindows()

static inline void RaiseSignal(int sig) {
  if (_weaken(__sig_raise)) {
    _weaken(__sig_raise)(sig, SI_KERNEL);
  } else {
    TerminateThisProcess(sig);
  }
}

textwindows int sys_ftruncate_nt(int64_t handle, uint64_t length) {

  // check file size limit
  if (length > ~__get_pib()->rlimit[RLIMIT_FSIZE].rlim_cur) {
    RaiseSignal(SIGXFSZ);
    return efbig();
  }

  // ask operating system to extend file
  if (!SetFileInformationByHandle(handle, kNtFileAllocationInfo, &length,
                                  sizeof(length))) {
    switch (GetLastError()) {
      case kNtErrorAccessDenied:
        return einval();  // ftruncate() doesn't raise EACCES
      default:
        return __winerr();
    }
  }

  // return success
  return 0;
}

#endif
